Much like a radio DJ a TV DJ does not actually select songs or jockey disks but fills the time between shows with random ramblings intended to engage the listener. Not to be confused by the more traditional announcer who simply informs the watcher of the following program.

The prime example of a TV DJ is the dude on C4 that reads out a random haiku before the Simpsons. There was also the hilarious spat of mispronouncing the show, possible to gauge if anyone was actually listening to them. Examples are as follows:
"The trimpsons"
"The Grimsons"
"Double Dimpsons"
"Crimpsons"
"The Flintstones"
"The Cheese & Onions"
Clearly by the end they had totally given up, or not understood the concept of cockney rhyming slang.

"I wish I knew what this TV DJ looked like so I could arrange for a piano to conveniently fall on his head."
"This TV DJ is inane."